First commit

IUT/Info1/TD/Exercices/5.3_surface_cyl/calculation.cpp

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+#include "functions.h"
+
+float PI = 3.141592;
+
+float Perimetre(float rayon) {
+    float perimetre;
+    
+    perimetre = PI * rayon * 2;
+    return perimetre;
+}
+
+float Surface(float rayon) {
+    float surface;
+
+    surface = PI * rayon * rayon;
+    return surface;
+}